This attribute indicates a unique number to identify a port. The valid port number depends on the IO slot no., the installed card type and the port type: outside/external, inside/internal. In the Kilomux, the port index is calculated as follows: 100*Slot+Ch. The external Ch numbers are 1..10, and the internal Ch numbers are 11..20. In the DXC : - first two digits will be: (IO slot number+10) - last one/two digits will be the port number within the card in odd or even numbers, as follows: * For the outside/external ports, in odd numbers: port1 = 1 port2 = 3 port3 = 5 etc... Example: port2 of IO slot 11 will be: 213 . * The inside/internal ports, in even numbers: port1 = 2 port2 = 4 port3 = 6 etc... Example: port2 of IO slot 11 will be: 214 . In the MP : - first two digits will be: (IO slot number+10) - last one/two digits will be according to the external port number within the card: exPrt1 -> 1 exPrt2 -> 3 exPrt3 -> 5 exPrt4 -> 7 .